Web of Life: Myst Sci 5

1. Scientists think that Tyrannosaurus rex was able to run at a speed of 12 miles per hour. Where did T. rex get the energy that it used to run when it was alive?

• T. rex got its energy from green plants, which got their energy from the Sun.

• T. rex got its energy from Triceratops. That energy is not connected to the Sun.

• T. rex got its energy directly from the Sun.

• T. rex got its energy from eating Triceratops. Triceratops ate green plants and green plants got their energy from the Sun.

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2. Scientists think that the dinosaurs went extinct because an asteroid hit the Earth and created a giant dust cloud that covered up the Sun. The T. rex ate other dinosaurs, so why would covering the sun harm T. rex?

• It wouldn't. T. rex is fine and still living today.

• T. rex ate plants.

• T. rex ate animals that ate plants. When plant eaters die, meat eaters will die too.

• When plants died, there was no fruit for T. rex. He died of vitamin deficiency.

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3. Which food chains shows how matter travels in a forest ecosystem?

• Dead leaves > earthworm > robin > hawk

• Hawk > robin > earthworm > dead leaves

• oak tree > squirrel > hawk

• dead leaves > cricket > robin > hawk

• oak tree > hawk > squirrel

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4. Scientists are worried that a disease that kills oak trees will spread into this forest. What would happen to this ecosystem if all the oak trees suddenly disappear? Choose all correct answers.

• c. If there aren’t any oak trees, the crickets may not have anything to eat because the robins may not survive.

• If there aren’t any oak trees, the squirrels will not have anything to eat. They will need to find another food source or they will not survive.

• If there aren’t any oak trees, the robins will not have anything to eat. They will need to find another food source or they will not survive.

• If there aren’t any oak trees, the worms will not have enough shade and they will dry out.

• If there aren’t any oak trees, the hawks may not have anything to eat because the squirrels and robins may not survive.

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5. Amir released some pet frogs into the forest ecosystem shown above. These frogs eat earthworms and crickets. Hawks, robins, and squirrels do NOT eat these frogs. What will happen to this ecosystem if the frogs start living here? Choose all correct answers.

• The squirrels will not have anything to eat. They will need to find another food source or they will not survive.

• The hawks will not have anything to eat. They will need to find another food source.

• The robins will not have anything to eat. They will need to find another food source or they will not survive.

• The dead leaves will pile up because the frogs will eat all the decomposers. The decomposers will not be there to eat the leaves.

• The dead leaves will not have anything to eat. They might have to start eating hawks.

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In Anna's plant experiment, did the weight of the plant increase, decrease or stay the same?

• Increase

• Decrease

• Stay the same

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In Anna's plant experiment, did the weight of the soil increase, decrease, or stay the same?

• Increase

• Decrease

• Stay the same

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What do the results of Anna's experiment prove?

• Plants don't "eat" soil.

• Plants do "eat" soil.

• Plants "eat" water.

• Plants "eat" air.

Anna does another experiment. She runs the experiment for 3 weeks. Look at the picture carefully. What conclusion can we make from this new experiment?

• Plants mostly use materials from the air for their growth.

• Plants mostly use materials from the soil for their growth.

• Plants mostly use materials from sunlight for their growth.

• Plants mostly use materials from water for their growth.

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